Develop Reference

Factual API and coldfusion

I took the java implementation of the Factual API (reference http://developer.factual.com/) and made a JAR file for factual. I did this by opening a new project in eclipse with the factual java files and then exporting to a new jar file.
I put that jar file in my coldfusion installation's /WEB-INF/lib/ folder.
After restarting Coldfusion, I tried to create a new cfobject like so
<cfscript>
// Initialize the Java class.
factualClass=CreateObject("java", "src.main.java.com.factual.driver.Factual");
</cfscript>
I get an error indicating that it cannot find the Factual class.
Can anybody give me some guidance?

(Summary from comments)
It sounds like you may be exporting the source files ie *.java rather than the compiled class files, ie *.class. In the Jar Export wizard, be sure to select the "Export generated class files and resources" option. (To automatically compile the project sources before expi, enable the setting: JAR packaging > Build projects if not build automatically option). If you prefer you can also find pre-compiled jars in the MVN repository.
put that jar file in my coldfusion installation's /WEB-INF/lib/
folder.
CF10+ also supports dynamic class loading via a new application level setting THIS.javaSettings.
// Initialize the Java class.
factualClass=CreateObject("java", "src.main.java.com.factual.driver.Factual");
Just as a point of interest, src/main/java/ is not actually part of the libary class name. It is a standard directory structure used in Maven projects. It is probably included when exporting the sources, but not the compiled classes.
You can always verify the correct path and class name either by examining the API ie javadocs or by viewing one the source files. Package declarations are always at the top of the source file, such as on line 1 of src/main/java/com/factual/driver/Factual.java:
package com.factual.driver; // ie "com.factual.driver"
.. and the class declaration on line 39.
public class Factual { // ie "Factual"
Combined that gives you the exact (case-sensitive) path to use with createObject:
factualClass=CreateObject("java", "com.factual.driver.Factual");

Loading resources in Java

I have a Java project and have to load resources such as sounds or images, which worked pretty well until I exported it into a jar file, where the app crashed because I it couldn't access the resources. I found after some research that I should use getClass().getClassLoader().getResource() or Class.getResource(). But after trying all the possibilities with the first or second function, with or without the leading /, but each time, I get null as a result, and used res/images/bg.jpg as argument. My project hierarchy looks like this:
|src
|Main.java
|res
|images
|bg.jpg
None of the solutions I've found on Stack Overflow or on Google worked for me. What am I doing wrong and what should I use?
EDIT
When exporting as jar, I am just right clicking on my project on Eclipse (without using any plug-ins), export and select runnable jar and explicitly declare my class Main as Classpath. When checking the content of the jar file, I can see the resources in the correct places.

The res folder should be a child of your src folder
|src
|Main.java
|res
|images
|bg.jpg
although standard practice would be to have the layout closer to
|src
| main
|java
|package
|Main.java
|resources
|images
|bp.jpg

The last time something like this happened to me, it was because my build did not copy the files into the jar. Might be worth doing a sanity check by listing the files in your jar:
jar tf /path/to/your.jar

Maven-war-plugin - remove files

I am developing maven plagin that obfuscates js files. It does the following -:
takes *.js files from target,
obfuscates them using google closure,
creates *.min.js files in target,
if it's necessary removes sources (unobfuscated files) from target.
In order to get point between package phase and prepare-package phase I use the following solution: https://stackoverflow.com/a/27566620/2022068
Everything is ok. Plugin is ready. However I have the following problem - if I remove source file, maven-war-plugin copies it again. Maybe it has some mechanism of checking - I don't know. The only thing that I can do now is to delete and create empty file. Than the source file exists but it's empty.
My qeustion - can I somehow remove files from target finally, forever...?

You probably need to teach this to the maven-war-plugin. I have no example that does the same thing but there are packageExcludes (see: http://maven.apache.org/plugins/maven-war-plugin/examples/including-excluding-files-from-war.html) which seems not exactly what you need but also warSourceExcludes: http://maven.apache.org/plugins/maven-war-plugin/war-mojo.html#warSourceExcludes
The war plugin has its own mechanism of copying files (aside from the resources plugin). That may be the issue here. There are some examples on filtering as well: http://maven.apache.org/plugins/maven-war-plugin/examples/adding-filtering-webresources.html
Maybe treating the files you don't want to see as excludes will work (if warSourceExcludes is something different than what you plan to do).

IntelliJ IDEA - how to copy .java file as a resource?

I am busy writing an integration test for a custom annotation processor. In order to do this I have a specific set of .java source files that I am running through javac in order to test my implementation. These are loaded by my test as a resource. This means that my source tree looks something like the following:
/src
/test [test source root]
/java
MyIntegrationTest.java [actual source code]
/resources
MyIntegrationClassFile.java [should be treated as plain text]
With IntelliJ, it is possible to filter what files are copied as resources using the Compiler Settings. So I removed the filter for .java files.
However, for resources to be copied, they need to be in a marked source tree. I also have my resources folder marked as test sources (yes, this is weird).
This is where the problem comes in: If the .java files are in a source tree (in order to be copied as resources), they are automatically compiled. I do not want to compile these files (they may not compile).
I have tried adding the resources to the compiler exclude list (NOT excluding it from the project), but this also results the resources not being copied.
You cannot mark a .java file as plain text, as far as I know, even though this feature is documented for other file types.
How can one mark a .java file as plain content that should be copied and not compiled?

For me it worked when I added the resource folder to the Compiler Exclude List.
Initial setup:
Rebuild project gives me this output:
Now I add the src/test/resources to the Compiler Exclude List:
After rebuild I have this in my output folder:

Using Idea 2016.3.3, go to Project Structure>src>test>resources then right click on it and select TestResources.
Then add an exclusion rule to Settings>Build, Execution, Deployment> Compiler> Excludes for your resources folder.
Also remove .java extension from Settings>Build, Execution, Deployment> Compiler>Resource patterns (you've already done this as I can see).
It works!

NoClassDefFoundError exception while using external library in EMF plugin project

I'm working on a EMF project where I've created a ecore model from a mdl file. I created the corresponding gencore file and generated the code from the gencore file. While EMF has a own serialization mechanism based on XMI I want to support my project with a own serializiation mechanism.
So far, I've done the necessary steps and if I use the debugger the corresponding methods are called. In order to read and write a file representation of my model I want to use an external library. I've done the following steps
Created a directory lib/ in my plugin project where I've put the external library
Added the library to the build path of the project
Added the directory to the bundle-classpath (Manifest.mf)
Added the directory to the bin.includes of the build.properties
If I try to run my code I get a NoClassDefFoundError exception and I don't know why. I've created a run configuration where I'm starting the project as a eclipse application. So somebody has an idea what I'm missing?
Thanks in advance!
Michael
Edit: Below my Manifest.mf file
Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: de.hs_rm.cs.vs.dsm.OWL
Bundle-SymbolicName: de.hs_rm.cs.vs.dsm.owl;singleton:=true
Bundle-Version: 1.0.0
Bundle-ClassPath: lib/,
.
Bundle-Localization: plugin
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Export-Package: owl,
owl.impl,
owl.util,
rdfs,
rdfs.impl,
rdfs.util
Require-Bundle: org.eclipse.core.runtime,
org.eclipse.emf.ecore;visibility:=reexport
Bundle-ActivationPolicy: lazy
and also my build.properties
bin.includes = .,\
model/,\
META-INF/,\
plugin.xml,\
plugin.properties,\
lib/
jars.compile.order = lib/,\
.
source.. = src/
output.. = bin/
source.lib/ = lib/
jars.extra.classpath = lib/owlapi-bin.jar

it's not really a hundred percent solution since I'm not aware what exactly the problem was at all. I've found a link where somebody had the exactly same problem (added a jar as library, NoClassDefFoundError exception during execution). So far, the necessary steps are:
Import JARs using the "Import -> File System"
Add the JAR-file(s) to the classpath section of the Manifest/plugin.xml runtime tab
Press "New..." to add "." library back to the classpath
Check that the binary build exports the new JAR-file(s) on the Build tab
Press save
Select the coressponding project in the project explorer view, right click and select "PDE Tools -> Update classpath". This will add the newly added JAR-file(s) to the project's classpath.
I've had some trouble with the last step since I've added the library by myself to the build path of the project. Every time I did this eclipse removed the library from the build path while executing the "Update classpath command". I've repeated step six without adding the library to the build path by myself and it's now working.
It seems a bit odd to me, but it's now working. Anyway I would like to thank you for your help!
Regards,
Michael

If you are writing Eclipse plugins and not plain old Java project you must add your library in the classpath field of the Runtime tab of the Manifest.mf editor.

Do you get the NoClassDefFoundError when trying to access the lib or when trying to access the Ecore model? If it is the latter case, check, whether your emf package has been registered in the plugin.xml file. Look for something like the following part:
<extension point="org.eclipse.emf.ecore.generated_package">
<package
uri="«package URI here»"
class="«package class name here»"
genModel="«genmodel location here»"/>
</extension>
This part can be missing, if the plugin.xml was generated before the genmodel was used for generation, as neither the manifest, nor the plugin.xml gets updated during the code generation process.
On the other hand, if the library accessing throws the exception, then I would try to remove and re-add the dependency, or clean build a project, but these seem unlikely to solve the exception.